1. In a population of normally distributed measurements, the mean equals 70. Say you took a random sample size of 16 from this population and found a sample mean of 80 and a sample standard deviation of 14. Is this sample mean significantly different from population using alpha equals .05?
T=
One or two tailed test?
T critical value=
Ho=
H1=
Reject or fail to reject Ho?
2. An advertising executive hypothesized the use of clay puppets in a TV ad would be rated as more interesting than humans, by a test audience. She randomly assigned subjects into two test groups. Test her hypothesis at alpha= 0.5. Here are her findings:
Clay pupped mean= 94, S=3, N=9 . Human actors mean=92, S=4, N=8
T=
One or two tailed test?
T critical value=
Ho=
H1=
Reject or fail to reject Ho?